1031 Stiffness Measurement of Universal Composites

Friday, March 23, 2012: 3:30 p.m. - 4:45 p.m.
Presentation Type: Poster Session
X. HUO, and V. TORRES, DENTSPLY, Milford, DE
Objective: The purpose of this study is to compare the stiffness of different universal composites.

Method: The universal composites used in the experiments are: EsthetX HD A2 (lot#1106201, Dentsply); TPH 3 A3.5 (lot# 1102131, Dentsply) ; Filtek Z100 A2 (lot# 8GN, 3M); Filtek Z250 A2 (lot# N269383, 3M);  Filtek Xtra A2 (lot# N276480, 3M); Venus Diamond BL (lot# 010022, Heareus); Herculite Ultra A2E (lot# 3707940, Kerr) and Tetric EvaCeram A2 (lot#P02083, Ivaclar). AElite LS Packabe A2 (lot# 1100004101, Bisco). The stiffness of composites was measured by TA XT Plus Texture Analyzer.  A 1.7 gram of composite was dispensed into a hole (φ16mm x 4 mm) drilled in a stainless steel plate which was kept in an environmental chamber with constant temperature of 23o C .  The excess amount of composite was removed by a Teflon spatula to make the paste surface even.  The cylinder probe (φ 4 mm ) aligned with the center of the hole started to approach the paste at 5.0 mm/s (pre-test Speed) until a 20.0 grams trigger force was detected.  The probe then began to compress the paste with a speed of 0.5 mm/s and traveled down a distance of 3 mm.  The curve of force vs time was recorded.    The slope (gradient) of the curve between 3.5 and 4 seconds was used as an indication of stiffness.  Means comparisons for all pairs using one way ANOVA Tukey’s test were applied for data analysis at a confidence level of 95%.

Result:

 

Glass Ionomers

Stiffness

Mean (Kg/sec x 0.01)

Stdev (Kg/sec x 0.01)

Group

Esthet-X HD

12.7

0.9

A

Venus Diamond

11.8

1.0

A

Filtek Z250

9.9

0.5

B

Tetric EvaCeram

8.9

0.3

B, C

Herculite Ultra

7.5

0.4

C, D

AElite LS

6.9

0.3

D

TPH3

4.6

0.4

E

Filtek Supre Xtra

3.8

0.6

E

Filtek Z100

1.7

0.3

F

Conclusion: A wide range of stiffness was found among the nine tested universal composites.  Esthet-X HD Venus Diamond and Filtek Z250 exhibited the highest stiffness, while TPH3, Filtek Supre Xtra and Filtek Z100 exhibited the lowest stiffness.  Differences in stiffness has a direct influence over the clinician’s preference for composite handling properties during placement.


Keywords: Composites and stiffness
Presenting author's disclosure statement: employment